/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jasper.el;

import javax.el.*;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

/**
 * Wrapper for providing context to ValueExpressions
 *
 * @author Jacob Hookom
 */
public final class JspValueExpression extends ValueExpression implements
		Externalizable {

	private ValueExpression target;

	private String mark;

	public JspValueExpression() {
		super();
	}

	public JspValueExpression(String mark, ValueExpression target) {
		this.target = target;
		this.mark = mark;
	}

	@Override
	public Class<?> getExpectedType() {
		return this.target.getExpectedType();
	}

	@Override
	public Class<?> getType(ELContext context) throws NullPointerException,
			PropertyNotFoundException, ELException {
		try {
			return this.target.getType(context);
		} catch (PropertyNotFoundException e) {
			if (e instanceof JspPropertyNotFoundException) throw e;
			throw new JspPropertyNotFoundException(this.mark, e);
		} catch (ELException e) {
			if (e instanceof JspELException) throw e;
			throw new JspELException(this.mark, e);
		}
	}

	@Override
	public boolean isReadOnly(ELContext context) throws NullPointerException,
			PropertyNotFoundException, ELException {
		try {
			return this.target.isReadOnly(context);
		} catch (PropertyNotFoundException e) {
			if (e instanceof JspPropertyNotFoundException) throw e;
			throw new JspPropertyNotFoundException(this.mark, e);
		} catch (ELException e) {
			if (e instanceof JspELException) throw e;
			throw new JspELException(this.mark, e);
		}
	}

	@Override
	public void setValue(ELContext context, Object value)
			throws NullPointerException, PropertyNotFoundException,
			PropertyNotWritableException, ELException {
		try {
			this.target.setValue(context, value);
		} catch (PropertyNotWritableException e) {
			if (e instanceof JspPropertyNotWritableException) throw e;
			throw new JspPropertyNotWritableException(this.mark, e);
		} catch (PropertyNotFoundException e) {
			if (e instanceof JspPropertyNotFoundException) throw e;
			throw new JspPropertyNotFoundException(this.mark, e);
		} catch (ELException e) {
			if (e instanceof JspELException) throw e;
			throw new JspELException(this.mark, e);
		}
	}

	@Override
	public Object getValue(ELContext context) throws NullPointerException,
			PropertyNotFoundException, ELException {
		try {
			return this.target.getValue(context);
		} catch (PropertyNotFoundException e) {
			if (e instanceof JspPropertyNotFoundException) throw e;
			throw new JspPropertyNotFoundException(this.mark, e);
		} catch (ELException e) {
			if (e instanceof JspELException) throw e;
			throw new JspELException(this.mark, e);
		}
	}

	@Override
	public boolean equals(Object obj) {
		return this.target.equals(obj);
	}

	@Override
	public int hashCode() {
		return this.target.hashCode();
	}

	@Override
	public String getExpressionString() {
		return this.target.getExpressionString();
	}

	@Override
	public boolean isLiteralText() {
		return this.target.isLiteralText();
	}

	@Override
	public void writeExternal(ObjectOutput out) throws IOException {
		out.writeUTF(this.mark);
		out.writeObject(this.target);
	}

	@Override
	public void readExternal(ObjectInput in) throws IOException,
			ClassNotFoundException {
		this.mark = in.readUTF();
		this.target = (ValueExpression) in.readObject();
	}
}
